JPS6218467B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for unwinding yarn from a wound yarn package. More specifically, the yarn is pulled out from the wound yarn package in the lateral direction (that is, in the direction perpendicular to the package axis), and the yarn package is untwisted without twisting while being passively rotated by the pulling tension of the yarn. In particular, the present invention relates to a method suitable for unwinding yarn from a yarn feeding package (multiple yarn package) in a fiber splitter. Many examples of inventions related to stabilizing the yarn path in the splitting process have been provided in the past, but it is difficult to intercept the multi-filament package and unravel it smoothly. It is not easy to separate the fibers to the end. The tension near the splitting point is greatly influenced by the unwinding tension of the yarn from the multi-filament package. Therefore, in order to make the yarn tension near the splitting point uniform, it is necessary to make the unwinding tension uniform. A method of actively feeding a multifilar yarn package using a splitter device is generally carried out while maintaining a stable tension, but this device requires expensive equipment and is not practical. Therefore, passive delivery is generally performed in which the package is rotated by unwinding tension. The problem with the passive feeding method is that under constant separation speed conditions, the rotation of the yarn feeding package gradually increases as winding progresses, compared to the beginning of winding when the yarn feeding package is fully wound. As you get closer, the rotational speed will be several times higher. In order to smoothly pull out the yarn from the yarn supply package under such changes in the rotational state, the design of the unwinding yarn path is most important. In other words, if the tension of the yarn leaving the package is abnormally high, when the yarn is unwound from the yarn supply package while being traversed (when the yarn supply package is wound in the previous process, the yarn is wound in a traverse manner). (Conversely, when the yarn is pulled out from this package, the yarn is pulled out in a traversing state), the yarn falls from the yarn layer on both end faces of the yarn feeding package, making it impossible to unwind smoothly, and causing yarn breakage. occurs. On the other hand, if the tension is low, the rotation of the yarn feeding package cannot be controlled. The present invention eliminates the above-mentioned drawbacks and provides a method for unwinding yarn from a winding package, especially a yarn feeding package for supplying multi-filament yarn in a splitting machine, without causing the end face to fall off, and with less tension fluctuation. Its purpose is to provide. In order to achieve the above object, according to the method of the present invention, the yarn pulled out from the wound yarn package passes through an oscillating yarn guide, and then is wrapped around the package circumferential surface for more than half a turn, and is then completely wrapped around the package circumferential surface. Winding is performed between the roller guide and the package by wrapping the yarn once, pressing the unwound yarn, then guiding it to the roller guide, and wrapping it again around the circumference of the package for more than half a turn before guiding it to the roller guide. After doing this one or more times, it is pulled out from the roller guide and unwound. The present invention will be described in detail below based on embodiments shown in the accompanying drawings. FIG. 1 is a schematic explanatory diagram showing a fiber splitting process in which multi-filament yarn is pulled out from a yarn supply package and split and wound by the unwinding method of the present invention. FIG. 2 is an enlarged explanatory view showing the unwinding path of the yarn from the wound yarn package in FIG. 1. FIG. 3 is a perspective view showing the unwinding yarn path from the wound yarn package similar to FIG. 2; A yarn supply package 1 wound with a non-twisted multi-filament yarn Y is set on a rotatable bobbin chuck 2, and the yarn end of the multi-filament yarn is pulled out. Since the yarn supplying package 1 itself is formed by traversing a multi-filament yarn, when the yarn Y is pulled out from the yarn supplying package 1, the yarn Y performs a traversing motion. In order to absorb the change in yarn length due to this traversing motion, the yarn Y pulled out from the yarn supply package is first passed through the oscillating yarn guide 3. Next, the yarn Y is wrapped around the circumference of the yarn supply package for more than half a turn (second
(indicated by reference numeral a in the figure), it is then wrapped once more completely around the circumference of yarn supply package 1 (this part is indicated by reference numeral b), and then hung on roller guide 4. The roller guide 4 is attached to a swinging arm 11 which is the source of actuation of a brake belt 12 that controls the rotation of the bobbin chuck 2, and the roller guide 4 is preferably itself rotatably mounted to the swinging arm 11. . The swing arm 11 is biased by a spring 10 so as to apply tension to the brake belt 12. After being wrapped around the roller guide 4 as described above, the yarn Y was again wrapped around the circumference of the yarn supply package 1 for more than half a turn (indicated by symbol c), and then wrapped around the roller guide 4 again. Afterwards, head to Guide Guide 5. After exiting the guide 5, the multi-filament thread 4 is separated into individual filaments on the splitting guide 6, resulting in split threads y ₁ , y ₂ , y ₃ . . . _yo ,
Each split yarn passes through a fixed guide 7, a traverse guide provided on a traverse bar 8, and is wound onto each winding pirn 9. As described above, the multi-filament yarn Y is pulled out from the yarn supply package 1 through the yarn path shown in FIGS. The yarn portion immediately after coming out of the yarn supply package 1 (hereinafter referred to as the package detached yarn portion) is the yarn portion b that is completely wrapped once around the circumferential surface of the yarn supply package 1 after passing through the oscillating yarn guide 3. Pass under it and head towards the swinging thread guide 3. Therefore, the yarn portion of the package cage detachment portion is held down by the wrapped yarn portion b, and the fluctuation in yarn tension caused by the change in yarn length at the center and both ends of the package cage due to traverse unwinding is absorbed by the swinging yarn guide 3. This is absorbed by the rocking motion of the package toward and away from the package. In addition, the winding thread portions a, b, and c come into contact with the threads on the outer surface of the package, providing appropriate frictional resistance. Therefore, tension due to winding is not directly applied to the package detachment thread portion, and the tension in the package detachment thread portion is reduced and stabilized. In this way, since the tension on the thread part detached from the package cage is small and it is held down by the wrapping thread part b, the thread is prevented from falling from the end face of the package cage even when the thread is pulled out from the end of the package cage. Ru. Further, according to the present invention, after passing through the roller guide 4 attached to the swinging arm 11, the yarn is wrapped around the circumferential surface of the yarn feeding package 1 (wound yarn portion c), and then guided through the roller guide 4 again. Since it is directed toward the guide 5, instantaneous tension changes can be adjusted better than in the past.
In other words, when the thread is passed around the roller guide 4 once and immediately directed to the guide 5 as in the conventional case, if there is an instantaneous tension change, the brake belt 1
2 controls the rotation of the bobbin chuck 2, but the swinging arm 11 swings too much against changes in tension, which tends to result in overcontrol (the bobbin chuck is braked too much or the braking is relaxed too much). In the present invention, after the yarn is wrapped around the roller guide 4 once, it is wrapped around the yarn supply package 1 for more than half a turn, and after it is wrapped around the roller guide 4 again, that is, the yarn is wound between the roller guide and the package. Since the thread is directed toward the guide 5 after performing the above once or more, the instantaneous tension change is caused by the winding thread part c.
Therefore, the swinging arm 11 supporting the roller guide 4 does not swing too much. In the embodiment described above, the roller guide 4 was attached to the swing arm 11, but the roller guide 4
may be placed in a stationary state. In this case, the unwinding tension of the package detached yarn portion is too low due to the frictional resistance of the roller guide, making it impossible to unwind smoothly, so it is necessary to use a roller guide with low frictional resistance. Preferably, the roller guide is rotatably provided. In addition, the number of windings of the yarn between the roller guide 4 and the yarn feeding package 1 is one in the embodiment (the roller guide is wound twice), but at the splitting point. It is desirable that the tension level of the balance spring 10 is increased or decreased in consideration of the tension of the unwound yarn due to the spring constant. An experimental example in which 15 filament yarns of 30 denier polyamide fibers were split at a splitting speed of 1000 m/mm is shown below.

[Table] According to the unwinding method of the present invention, even if the fed yarn is separated by passive feeding at a high speed of 1000 to 1200 m/mm, the end face of the yarn does not fall off in the fed yarn package. Unwinding is smooth, fluctuations in unwinding tension can be well controlled, and therefore, the multi-filament yarn to be split can be stably supplied to the splitting point.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing a fiber splitting process in which multi-filament yarn is pulled out from a yarn supply package and split and wound by the unwinding method of the present invention. FIG. 2 is an explanatory view showing the unwinding path of the yarn from the wound yarn package in FIG. 1. FIG. 3 is a perspective view showing the unwinding yarn path from the wound yarn package similar to FIG. 2; 1... Yarn feeding package, 2... Bobbin chuck, 3... Swinging yarn guide, 4... Roller guide,
5... Guide guide, 6... Separating guide, 7... Fixed guide, 8... Traverse bar, 9... Winding pirn, 10... Spring, 11... Swinging arm.

Claims (1)

[Claims] 1. When the thread is pulled out from the thread package in a direction perpendicular to the axis and untwisted while the thread package is passively rotated by the tension of the thread,
The unraveled yarn is first guided to the oscillating yarn guide, then wrapped around the package cage circumferential surface for more than half a turn, and then wrapped completely once around the package cage circumferential surface while holding down the unwound yarn.
Next, the package is guided to a roller guide, and then wrapped around the circumference of the package for more than half a turn, and then guided to the roller guide. After winding the package between the roller guide and the package an appropriate number of times, the package is pulled out from the roller guide and released. A yarn unraveling method characterized by yarn unraveling.